diff --git a/jina/jaml/parsers/base.py b/jina/jaml/parsers/base.py
index e8c1d1b28bdb1..424111d433da7 100644
--- a/jina/jaml/parsers/base.py
+++ b/jina/jaml/parsers/base.py
@@ -20,6 +20,7 @@ class VersionedYAMLParser:
     def parse(self, cls: type, data: Dict) -> Union['BaseFlow', 'BaseExecutor', 'BaseDriver']:
         """Return the Flow YAML parser given the syntax version number
 
+        :param cls: target class type to parse into, must be a :class:`JAMLCompatible` type
         :param data: flow yaml file loaded as python dict
         """
         raise NotImplementedError